⚡ Energy converter

Kilojoules to Kilocalories Converter

Convert kilojoules (kJ) to kilocalories (kcal) instantly. Includes formula, worked example, and a full reference chart from 1 to 1000 kJ.

Kilojoules

Kilocalories

kcal

How to convert kilojoules to kilocalories

One kilojoule equals approximately 0.239 kilocalories. To convert kilojoules to food kilocalories, divide by 4.184. A 2,000 kJ meal contains about 478 kcal.

Formula

kcal = kJ ÷ 4.184

Worked example

Convert 2000 kJ to kcal:
2000 kJ × 0.2390057361376673 → 478.011472 kcal

Common kilojoules to kilocalories values

Quick reference for common kilojoule values:

1 kJ = 0.239006 kcal
5 kJ = 1.195029 kcal
10 kJ = 2.390057 kcal
100 kJ = 23.900574 kcal

Kilojoules to Kilocalories conversion table

Full reference chart — useful for cooking, fitness, engineering, or homework.

Kilojoules	Kilocalories
1 kJ	0.239006 kcal
2 kJ	0.478011 kcal
3 kJ	0.717017 kcal
5 kJ	1.195029 kcal
10 kJ	2.390057 kcal
20 kJ	4.780115 kcal
25 kJ	5.975143 kcal
50 kJ	11.950287 kcal
75 kJ	17.92543 kcal
100 kJ	23.900574 kcal
250 kJ	59.751434 kcal
500 kJ	119.502868 kcal
1000 kJ	239.005736 kcal

Kilocalories to Kilojoules table (reverse)

Looking the other way? Here's the reverse conversion:

Kilocalories	Kilojoules
1 kcal	4.184 kJ
2 kcal	8.368 kJ
3 kcal	12.552 kJ
5 kcal	20.92 kJ
10 kcal	41.84 kJ
20 kcal	83.68 kJ
25 kcal	104.6 kJ
50 kcal	209.2 kJ
75 kcal	313.8 kJ
100 kcal	418.4 kJ
250 kcal	1,046 kJ
500 kcal	2,092 kJ
1000 kcal	4,184 kJ

Frequently asked questions

How many kilocalories are in 1 kilojoule?

There are 0.239006 kcal in 1 kJ.

How many kilocalories are in 10 kilojoules?

10 kJ = 2.390057 kcal.

How many kilojoules are in 1 kilocalorie?

1 kcal = 4.184 kJ.

What is the formula to convert kilojoules to kilocalories?

The formula is kcal = kJ ÷ 4.184.

Are kilojoules the same in the US and UK?

Food labels in most countries outside the US display kilojoules (kJ); US labels show kilocalories (kcal), often called "calories" on packaging.